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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net income $ 304,384 $ 318,325
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation and amortization 342,994 295,632
Allowance for doubtful accounts 6,520 5,674
Amortization of deferred financing costs and debt discount 5,024 4,623
Accretion of environmental liabilities 10,710 10,139
Changes in environmental liability estimates (8,933) 4,347
Deferred income taxes 0 (418)
Other (income) expense, net (1,982) 2,431
Stock-based compensation 22,620 20,690
Environmental expenditures (10,960) (19,679)
Changes in assets and liabilities, net of acquisitions:    
Accounts receivable and unbilled accounts receivable (113,131) (145,647)
Inventories and supplies 8,301 (39,673)
Other current and long-term assets (5,467) (47,826)
Accounts payable (35,492) 30,004
Other current and long-term liabilities (12,956) 35,211
Net cash from operating activities 511,632 473,833
Cash flows used in investing activities:    
Additions to property, plant and equipment (303,169) (369,826)
Proceeds from sale and disposal of fixed assets 15,250 6,353
Acquisitions, net of cash acquired 0 (474,011)
Proceeds from sale of business 0 750
Additions to intangible assets including costs to obtain or renew permits (1,528) (2,545)
Purchases of available-for-sale securities (62,108) (73,682)
Proceeds from sale of available-for-sale securities 74,968 100,021
Net cash used in investing activities (276,587) (812,940)
Cash flows (used in) from financing activities:    
Change in uncashed checks (2,639) (5,852)
Tax payments related to withholdings on vested restricted stock (13,833) (11,514)
Repurchases of common stock (117,001) (30,215)
Proceeds from employee stock purchase plan 3,360 0
Deferred financing costs paid 0 (8,316)
Payments on finance leases (25,088) (23,596)
Principal payments on debt (11,327) (11,327)
Proceeds from issuance of debt, net of discount 0 499,375
Net cash (used in) from financing activities (166,528) 408,555
Effect of exchange rate change on cash 3,488 (1,775)
Increase in cash and cash equivalents 72,005 67,673
Cash and cash equivalents, beginning of period 687,192 444,698
Cash and cash equivalents, end of period 759,197 512,371
Cash payments for interest and income taxes:    
Interest paid 133,520 134,177
Income taxes paid, net of refunds 93,531 100,752
Non-cash investing activities:    
Property, plant and equipment accrued 36,604 43,604
ROU assets obtained in exchange for operating lease liabilities 51,736 98,927
ROU assets obtained in exchange for finance lease liabilities $ 59,937 $ 53,391